暂时不用的光纤头部直接整齐放在线箱里（错）分光器测试：对分光

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问题判断题

暂时不用的光纤头部直接整齐放在线箱里（错）分光器测试：对分光器每个端口进行测试，以保证分光器插损值符合规范要求。如果全程衰减测试已通过，则无需进行分光器测试

答案

参考答案：对

选择题

A survey has shown that 40% of those killed in traffic accidents _____ if they had been wearing seat belts.

A．should have been saved

B．must have been saved

C．need have been saved

D．could have been saved

判断题

板框式过滤机中，由滤布与滤板围成的空腔是容纳滤饼的空间。